Add initial typings (#1127) #533

Job	Run time
test-postgres (9.5)	4m 5s
test-platforms (3.8, ubuntu-latest, asyncio)	3m 24s
test-postgres (9.6)	3m 48s
test-platforms (3.8, ubuntu-latest, uvloop)	3m 43s
test-postgres (10)	3m 49s
test-platforms (3.8, macos-latest, asyncio)	3m 0s
test-postgres (11)	4m 0s
test-platforms (3.8, macos-latest, uvloop)	3m 40s
test-postgres (12)	3m 43s
test-platforms (3.8, windows-latest, asyncio)	4m 37s
test-postgres (13)	3m 40s
test-platforms (3.9, ubuntu-latest, asyncio)	3m 25s
test-platforms (3.9, ubuntu-latest, uvloop)	3m 15s
test-platforms (3.9, macos-latest, asyncio)	3m 21s
test-postgres (14)	3m 35s
test-platforms (3.9, macos-latest, uvloop)	2m 49s
test-postgres (15)	3m 54s
test-platforms (3.9, windows-latest, asyncio)	4m 27s
test-postgres (16)	3m 40s
test-platforms (3.10, ubuntu-latest, asyncio)	5m 3s
test-platforms (3.10, ubuntu-latest, uvloop)	3m 18s
test-platforms (3.10, macos-latest, asyncio)	2m 37s
test-platforms (3.10, macos-latest, uvloop)	3m 30s
test-platforms (3.10, windows-latest, asyncio)	5m 35s
test-platforms (3.11, ubuntu-latest, asyncio)	3m 16s
test-platforms (3.11, ubuntu-latest, uvloop)	3m 4s
test-platforms (3.11, macos-latest, asyncio)	2m 49s
test-platforms (3.11, macos-latest, uvloop)	3m 38s
test-platforms (3.11, windows-latest, asyncio)	5m 32s
test-platforms (3.12, ubuntu-latest, asyncio)	3m 25s
test-platforms (3.12, macos-latest, asyncio)	3m 22s
test-platforms (3.12, windows-latest, asyncio)	5m 11s
Regression Tests	0s
	2h 0m 15s

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